PROBLEM TO BE SOLVED: To provide a pharmaceutical composition which contains a compound having P2X7 receptor inhibitory action and is useful in treating diseases in which a P2X7 receptor is involved, such as pain.SOLUTION: The pharmaceutical composition contains, e.g., a compound having a specific chemical structure represented by the compound represented by formula I-0006, or a pharmaceutically acceptable salt thereof.SELECTED DRAWING: None【課題】P2X7受容体阻害作用を有する化合物を含有し、例えば、疼痛のようなP2X7受容体が関与する疾患を治療するのに有用な医薬組成物の提供。【解決手段】例えば、式I-0006で示される化合物で代表される特定の化学構造を有する化合物又はその製薬上許容される塩を含有する医薬組成物。【選択図】なし